Скачать или смотреть PHP Inbuilt Functions

$num=10;
$n=5.111;
$arr=array(22,46,140,315,115);
echo ". Your number is : $num".';
echo ". Array elements in variable array are : ";
echo "$arr[0],"."$arr[1],"."$arr[2],"."$arr[3],"."$arr[4] ".;
echo "1. Using abs function your number is : ".abs ($num);
echo "2. Using sqrt function your number is : ".sqrt ($num);
echo "3. Using log function your number is : ".log ($num);
echo "4. Using ceil function your number is : ".ceil ($n);
echo "5. Using floor function your number is : ".floor ($n);
echo "6. Round Function ".round(log($num),3);
echo "7. Using pow function your number is : ".pow($num,4);
echo "8. Maximum number is : ".max ($arr);
echo "9. Minimum number is : ".min ($arr);
echo "10. The value of sin 90 is : ".sin(90);
echo "11. The value of cos 90 is : ".cos(90);